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Looks to be an SMLE .303 Lee Enfield, with the magazine cut off in place which is very uncommon for these rifles.
Most all magazine cut offs were removed when they re did the older No.1 MkIII rifles to the MkIII* standard.
Can't see the rear sight well enough to tell if it has the windage adjustment wheel. If both features are intact its a pretty good find. If the volley sight on the left side were there it would be really neat.

PS
To the above.
Since the rear sight protector is missing I'm guessing the fore end has been cut down as well. The fore ends are sometimes available but the other fittings like muzzle cap and bands can run up the cost of restoration.
If sporterized the value is severely reduced, maybe $150 at most, perhaps less if it has other issues.

Looks like a standard SMLE/ShtLE/No.1 MkIII to me that's been sporterized

I own a 1918 SSA made version which lacks the mag-cutoff but otherwise appears same. Lee Enfields made pre WWI and in the early wartime years had the mag cutoff which was deleted later in the war years. These were made by quite a few countries and companies...RFI in India made a variation of the same rifle well into the 1960's. In Great Britain Enfield, BSA, Sparkbrook, LSA, SSA/NRF, and probably other firms made these.

The newer No.4 MkI/II were also made by many firms and countries...including Savage in the US. These differ considerably from the older No.1MkIII. I have seen quite a few Lee Enfields converted to sporters and the old .303 has been a fairly popular round for hunting.